lack of feedback from vodacom and do not keep prom

It is 6months later since I upgraded my contract with vodacom and was told that BIS was free and part of package.Every single month on the last day of the month my BIS is deactivated and I have to phone in andog a call to have it reinstated. This takes about a week to resolve but yet I pay my full subscription for the entire month but do not have BIS for the entire month.the cal centre always say that it's will never happen again but it is 6months later and it still is a problem.They always say that they have a system problem and that other people have the same problem.I do not care as I am paying for a service but do not have the privilege of using it for an entire month.I constantly rate them 0 iny surveys and have emailed the complaints dept but nobody bothers to contact me for feedback.WHen I ask to speak to a manager I get put on hold for at least 20mins and then get cut off.this service sucks and I have been with vofacom for over 10 years and now want my money refunded and will move to another service provider who gates about their customers.